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Smaart (System Measurement Acoustical Analysis in Real Time) is a suite of audio and acoustical measurements and instrumentation software tools[1] introduced in 1996 by JBL's professional audio division. It is designed to help the live sound engineer optimize sound reinforcement systems before public performance and actively monitor acoustical parameters in real time while an audio system is in use. Most earlier analysis systems required specific test signals sent through the sound system, ones that would be unpleasant for the audience to hear. Smaart is a source-independent analyzer and therefore will work effectively with a variety of test signals including speech or music.
Smaart's transfer function requires a stereo input to the computer because it analyzes two channels of audio signal. Using its dual-FFT mode, Smaart compares one channel with the other to show the difference. This is used by live sound engineers to set up concert sound systems before a show and to monitor and adjust these systems during the performance. The first channel of audio undergoing analysis is connected directly from one of the main outputs of the mixing console and the second channel is connected to a microphone placed in the audience listening area, usually an omnidirectional test microphone with a flat, neutral pickup characteristic. The direct mixing console audio output is compared with the microphone input to determine how the sound is changed by the sound system elements such as loudspeakers and amplifiers, and by the room acoustics indoors or by the weather conditions and acoustic environment outdoors. Smaart displays the difference between the intended sound from the mixer and the received sound at the microphone, and this real-time display informs the audio engineer's decisions regarding delay times, equalization and other sound system adjustment parameters.
Smaart is primarily aimed at sound system operators to assist them in setting up and tuning sound systems. Other users include audio equipment designers and architectural acousticians. Author and sound engineer Bob McCarthy wrote in 2007 that because of Smaart's widespread acceptance at all levels of live sound mixing, the paradigm has reversed from the 1980s one of surprise at finding scientific tools in the concert sound scene to one of surprise if the observer finds that such tools are not being used to tune a sound system.[13]
Inputs are organized and added into Groups under the Group Manager, where you'll find parameters including averaging and weighting. Version 7.1 is the first to support multiple channels, enabling simultaneous measurement of, for example, console output, a mic at FOH, another mic in the balcony, etc. Active channels are viewed "overlay" style; clicking on an input in the Control Strip brings its trace to the front of a window. It'd be nice if you could tile the screen into separate windows for each trace (e.g. four windows of RTA, each displaying a channel).
Smaart's Transfer Function allows comparison between a reference signal and the post-process version of that signal in an audio system, measurements which reveal interesting traits. An example is shown in figure 4, the Transfer Function of a monitor system in a small control room. This was measured by generating pink noise (from Smaart's signal generator), splitting it and sending it directly into Smaart on the Reference channel and also to the monitors. A measurement mic picked was connected to the Measurement channel. This comparison involves a delay between the two signals (the Reference signal does not travel through the air, and therefore reaches Smaart faster). To maintain accuracy, there must be compensation for the delay. Smaart has an automatic delay finder that calculates delay, even while you are moving the mic around the room. It worked perfectly. In Fig. 4, the lower two windows show Transfer Function. The middle trace (green) shows frequency versus phase difference while the bottom window shows magnitude (green) versus frequency difference between reference and measurement mic. The bottom also shows "Coherence" in red (a discussion of coherence is beyond the scope of this article, but it points toward reliability of accumulated data). In this particular instance we are in Live IR Mode, so Smaart added a third window at the top of the screen with amplitude versus time difference between the two channels. The green spike at approximately 5.6 mS and the smaller bump roughly one mS later provide insight as to why the green trace in the Phase window looks so erratic (phase problems and comb filtering), and also why the red trace is not as coherent as we might like.
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Speed up your workflow and give your audio tracks maximum transparency with the content-aware limiter smart:limit, the source-adaptive reverb smart:reverb, the intelligent equalizer smart:EQ 3, the content-aware gate smart:gate, the spectro-dynamic compressor smart:comp 2 and the content-aware de-esser smart:deess. All of them deliver results within just a few seconds.
smart:gate features intelligent source detection that focuses on your selected target source in the signal. In comparison with conventional gates, smart:gate delivers solid results and makes parametrization incredibly fast and easy.
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The Electronic Delivery version of Smaart v.8 will send you a license code via e-mail along with links to both Mac and PC installers and all necessary registration and installation instructions. There is no printed manual for Smaart v.8. Please refer to the Help Files integrated within the Smaart program as well as the "Getting Started with Smaart v.8" Applications Guide available in PDF format on our web site.
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